Low-cycle fatigue performance and life prediction of a new duplex stainless steel UNS S32001
Peng Dai,Yuanqing Wang,Tianxiong Zhang,Mingze Wu,Yecheng Dai
Abstract
S32001 duplex stainless steel has recently been developed as a structural material in building
engineering, offering an attractive balance of high mechanical strength, cost efficiency, and excellent corrosion
resistance. Nevertheless, its low-cycle fatigue (LCF) behaviour has not been adequately investigated, which limits its
wider engineering application. In this study, strain-controlled LCF tests were conducted on S32001 stainless steel
under two strain ratios which comprised -1 and 0. For each strain ratio, seven strain amplitudes were employed
which included 1.0%, 1.25%, 1.5%, 1.75%, 2.0%, 2.25% and 2.5%. The experimental program focused on cyclic
deformation characteristics, stress-strain response, and fracture morphology. Fatigue life was further assessed using
the Basquin-Coffin-Manson framework and a strain energy-based model. The results revealed that S32001 stainless
steel exhibits a clear cyclic hardening-softening sequence and possesses fatigue resistance superior to that of
conventional structural steels. Life prediction analyses indicated that the strain-life approach provides effective fatigue
life estimations, with the Basquin-Coffin-Manson model showing better agreement with the experimental data than
the strain energy model.
